It has been narrated on the authority of Abdullah b. Umar that the Messenger of Allah ﷺ used to forbid that one should travel to the land of the enemy taking the Qur'an (with him) lest it should fall into the hands of the enemy.

وَحَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا لَيْثٌ، ح وَحَدَّثَنَا ابْنُ رُمْحٍ، أَخْبَرَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنْ عَبْدِ، اللَّهِ بْنِ عُمَرَ عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ كَانَ يَنْهَى أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ مَخَافَةَ أَنْ يَنَالَهُ الْعَدُوُّ .